Enhanced stability against spin torque noise in current perpendicular to the plane self-biased differential dual spin valves

We present a detailed study of spin transfer torque induced noise in self biased differential dual spin valves (DDSV) which could be potentially used as magnetic read-heads for hard-disk drives. Micro-magnetics studies of DDSV were performed in all the major magnetic configurations experienced by mad-heads and we show that in every case, self-biased DDSV provide a much stronger stability against spin-transfer torque noise than conventional spin valves. Provided are also insights on the influence of the dipolar interlayer coupling, shape anisotropy, exchange bias and relative orientation between the 2 free layers. Our results demonstrate the viability of DDSV read-heads for future hard disk doves generations. (C) 2014 Elsevier B.V. All rights reserved.